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80 lines
1.4 KiB
80 lines
1.4 KiB
package clickhouse
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import (
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"database/sql/driver"
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)
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func placeholders(query string) []int {
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n := 0
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quote := false
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first := -1
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for i := 0; i < len(query); i++ {
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switch query[i] {
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case '\\':
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i++
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case '\'':
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quote = !quote
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case '?':
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if !quote {
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n++
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if first == -1 {
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first = i
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}
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}
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}
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}
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if n == 0 {
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return nil
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}
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quote = false
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index := make([]int, n)
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n = 0
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for i, ch := range query[first:] {
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switch ch {
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case '\'':
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quote = !quote
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case '?':
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if !quote {
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index[n] = first + i
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n++
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}
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}
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}
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return index
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}
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func interpolateParams(query string, params []driver.Value) (string, error) {
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return interpolateParams2(query, params, placeholders(query))
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}
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func interpolateParams2(query string, params []driver.Value, index []int) (string, error) {
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if len(index) != len(params) {
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return "", ErrPlaceholderCount
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}
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if len(params) == 0 {
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return query, nil
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}
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var (
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queryRaw = []byte(query)
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paramsEncoded = make([][]byte, len(params))
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n = len(queryRaw) - len(index) // do not count number of placeholders
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)
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for i, v := range params {
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paramsEncoded[i], _ = textEncode.Encode(v)
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n += len(paramsEncoded[i])
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}
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buf := make([]byte, n)
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i := 0
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k := 0
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for j, idx := range index {
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copy(buf[k:], queryRaw[i:idx])
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k += idx - i
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copy(buf[k:], paramsEncoded[j])
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i = idx + 1
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k += len(paramsEncoded[j])
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}
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copy(buf[k:], query[i:])
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return string(buf), nil
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}
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